15x = 60
The variable is x.
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An equation in the variable n.
2 x 15
Fifteen times forty-five equals six hundred and seventy-five (15 x 45 = 675)
As usual when solving equations, you need to "isolate" the variable, in this case, the variable "x". 4x means 4 times x; if you divide both sides of the equation (the left side and the right side) by 4, you will have achieved this.
nine times five and fifteen times three is all i know